Ease your dogs urinary tract disease with nutritional support from Prescription Diet c/d dry dog food. This diet is formulated specifically to provide nutritional management of dogs with struvite-related urinary tract disease. Urinary tract disease is associated with the build-up of crystals and stones in the urinary tract that can cause painful and bloody urination and potential blockage in your dog. One type of crystal that forms in a dogs urinary tract is called struvite. Prescription Diet c/d has reduced levels of magnesium and phosphorus, and also produces an acid urine pH to aid in the management of struvite crystals and stones. The nutritional formulation of Prescription Diet c/d may also be useful for pets with a variety of conditions. *Offer valid on a single Hill's product AutoShip per account per year. Offer resets January 1. Maximum savings of $20.